New endoscopic ultrasound techniques for digestive tract diseases: A comprehensive review

Figure 3 Typical contrast-enhanced harmonic endoscopic ultrasound images of pancreatic tumors. A: Pancreatic carcinoma with hypoenhancement. Conventional EUS (left) shows a hypoechoic mass at the pancreas tail. Contrast-enhanced harmonic endoscopic ultrasound (CH-EUS) (right) indicates that the mass has hypoenhancement compared with the surrounding tissue; B: Chronic pancreatitis with isoenhancement. Conventional EUS (left) shows a hypoechoic mass at the pancreas body. CH-EUS (right) indicates homogeneous enhancement mass similar to the surrounding tissue; a margin is not observed; C: Neuroendocrine tumor with hyperenhancement. Conventional EUS (left) shows a hypoechoic mass at the pancreas body. CH-EUS (right) indicates that enhancement in the mass is higher than in the surrounding tissue (Kwek et al[65]).